Donald Trump claimed Saturday that he’s “asking law enforcement to check for dishonest early voting in Florida," but neither the state’s law enforcement agency nor elections officials have received any complaints or reports of voting irregularities.

Without any supporting evidence, Trump leveled his claim in two Twitter posts, suggesting the alleged activity was being done to help Sen. Marco Rubio of Florida, who might be closing the gap with the frontrunner in the final days of the campaign.

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Trump’s allegation, retweeted thousands of times, was issued on the last day of mandatory statewide in-person early voting, amid heavy turnout in urban counties where, polling indicates, Rubio is hoping to do well — especially in his home county of Miami-Dade, where 90,000 of the 1 million early and absentee ballots in Florida have been cast as of Saturday. Trump did not explain where the alleged fraud is happening and his campaign did not respond to an email for further explanation.

“Word is-early voting in FL is very dishonest. Little Marco, his State Chairman, & their minions are working overtime-trying to rig the vote,” Trump wrote on Twitter at 1:06 p.m.

“We are asking law enforcement to check for dishonest early voting in Florida- on behalf of little Marco Rubio,” Trump wrote a minute later. “No way to run a country!”

The Rubio campaign didn’t reply for comment immediately. One of Rubio’s Florida co-chairman, former state House Majority Leader Adam Hasner, ridiculed Trump’s claim about him and campaign “minions” trying to rig the process.

“I don’t know about minions, but I do know about Minyans,” Hasner, a Jewish Republican activist, said via text message, referring to a gathering of Jewish worshippers.

The Republican Party of Florida chairman, Blaise Ingoglia, wasn’t sure if Trump was targeting him. So he noted on Twitter that he was neutral in the race and wished all of the GOP candidates good luck.

Though Trump said he would ask for police help, the Florida Department of Law Enforcement, which has investigated voter-fraud claims in prior elections, said it has received no complaints from Trump or anyone during this election.

And the people who run elections in Florida at the state and local level say there have been no signs or complaints of voter fraud.

In Miami-Dade, there have been no complaints and no reports of voting irregularities, said Elections Supervisor Christina White. Miami-Dade and some other counties have one last day of early in-person voting on Sunday, but most do not.

Some election supervisors echoed White. Some expressed bewilderment at or disappointment with Trump’s allegation.

“This is a very vague yet serious accusation. How is the early vote being dishonest or rigged? We have not heard of any of these accusation here in Citrus County,” Susan Gill, the area’s election supervisor, said via email.

“There have been no allegations or complaints about fraud taking place in Martin County. The only poll watchers we have are from the Trump campaign and they have not expressed any concerns,” said Vicki Davis, Martin County’s election supervisor.

Due to voter ID rules and monitoring of election turnout, fraud is difficult to commit at in-person early voting sites. It could be slightly easier with absentee-ballot voting, but the perpetrator would likely have to forge a person’s signature accurately and then cast a phony ballot without the voter becoming aware.

“Voter fraud has become more of campaign tool to deter voter participation than documented proof,” Orange County’s election supervisor, Bill Cowles, said in an email.

Some suspected that Trump was trying to motivate his voters to cast more ballots now that some surveys and election turnout data suggest Rubio might be closing the gap on the frontrunner, although he trails Trump by anywhere from 5 to 23 percentage points in public polls. At least one poll indicated Rubio was winning the early and absentee vote by a large margin, but others said Trump was winning it handily.

“Donald Trump is the ultimate cornered dog when he takes to Twitter with something like this,” said Steve Schale, one of Florida’s top Democratic consultants who has been monitoring early voting trends and polling data. "He wouldn’t Tweet about voter fraud if he didn’t feel as if the election was a lot closer than he wants it to be."

“It’s still an uphill climb for Rubio,” Schale said, adding that “it’s hard to say what Trump is really up to.”